Method _clickNode

modules/modes/DrawLineMode.js:608–681

* _clickNode * Clicked on a target node, include that node in the line we are drawing.

(loc, targetNode)

   * Clicked on a target node, include that node in the line we are drawing.
   */
  _clickNode(loc, targetNode) {
    const EPSILON = 1e-6;
    const context = this.context;
    const editor = context.systems.editor;

    let graph = editor.staging.graph;
    let drawWay = this.drawWayID && graph.hasEntity(this.drawWayID);
    let drawNode = this.drawNodeID && graph.hasEntity(this.drawNodeID);
    let lastNode = this.lastNodeID && graph.hasEntity(this.lastNodeID);
    let firstNode = this.firstNodeID && graph.hasEntity(this.firstNodeID);

    // Extend line by reusing target node as a vertex...
    // (Note that we don't need to replace the draw node in this scenario)
    if (drawWay) {

      // Target node is the last node - finish the line here.
      if (targetNode.id === lastNode.id || vecEqual(loc, lastNode.loc, EPSILON)) {
        this._finish();
        return;
      }

      if (DEBUG) {
        console.log(`DrawLineMode: _clickNode, extending line to ${targetNode.id}`);  // eslint-disable-line no-console
      }

      editor.perform(
        this._actionRemoveDrawNode(drawWay, drawNode),                 // Remove the draw node from the draw way
        actionAddVertex(drawWay.id, targetNode.id, this._insertIndex)  // Add target node to draw way
      );

      // If the line has enough segments, commit the work in progress so we can undo/redo to it.
      const annotation = this._getAnnotation();
      if (annotation) {
        editor.commit({ annotation: annotation, selectedIDs: [drawWay.id] });
        this._takeSnapshot(firstNode.id, targetNode.id);
      }

      // Target node is the first node - we just closed the line and can finish it.
      if (targetNode.id === firstNode.id || vecEqual(loc, firstNode.loc, EPSILON)) {
        this._finish();
        return;

      // Target node is some other node - put the draw node back and continue drawing..
      } else {
        this.lastNodeID = targetNode.id;
        editor.perform(
          actionAddEntity(drawNode),
          actionAddVertex(drawWay.id, drawNode.id, this._insertIndex)
        );
      }

    // Start a new line at target node...
    } else {
      if (DEBUG) {
        console.log(`DrawLineMode: _clickNode, starting line at ${targetNode.id}`);  // eslint-disable-line no-console
      }

      drawNode = osmNode({ loc: loc });